Add Watermark to PDF Online Free
Runs 100% in your browser — your files never leave your device.
Marking a document DRAFT before it circulates, or CONFIDENTIAL before it leaves the building, should take seconds, not a desktop app. Type the text, set the opacity, choose diagonal or a tiled grid, and every page is stamped the same. Runs entirely on your device — the document is never uploaded.
How it works
- 1
Drop your PDF
The file stays on your device throughout.
- 2
Set the watermark
Text, opacity, diagonal slant, and single or tiled placement.
- 3
Download the stamped PDF
Every page carries the mark; one click saves it.
About this tool
Stamping a watermark across a PDF
The tool writes your text across every page of the PDF — DRAFT, CONFIDENTIAL, a name, a company — with control over position, rotation, opacity, and tiling. The watermark becomes part of every page, visible in any reader and any print.
Watermarks that work
A watermark has one job: marking the document's status at a glance without destroying readability. Low opacity with large diagonal text reads as intentional; full-opacity small text reads as graffiti. Tiling suits "CONFIDENTIAL" blankets; a single centered stamp suits "DRAFT".
Everything happens in your browser
The PDF is read, watermarked, and written entirely on your device — nothing is uploaded. Contracts and drafts get their marks without ever leaving your hands.
Frequently asked questions
Can I use an image as the watermark?
This tool applies text watermarks with full position and style control. Image watermarks are a different job for a design tool.
Will the watermark appear on every page?
Yes — the watermark stamps every page of the document, at the opacity and position you set.
Is the watermark removable by the recipient?
The watermark becomes page content — like the text of the document itself, it is not separately protected. For tamper-evidence, combine a watermark with a password.